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Membrane Fluidity

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CO2-switchable viscoelastic fluids based on a pseudogemini surfactant.

Yongmin Zhang1, Yujun Feng, Yuejiao Wang

  • 1Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, People's Republic of China.

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Summary

Researchers developed CO2-switchable wormlike micelles (WLMs) using sodium dodecyl sulfate (SDS) and N,N,N',N'-tetramethyl-1,3-propanediamine (TMPDA). These stimuli-responsive surfactant systems reversibly transition between wormlike and spherical micelles, offering tunable viscoelastic properties.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Colloid Science

Background:

  • Stimuli-responsive surfactant systems are gaining attention for their tunable properties.
  • Wormlike micelles (WLMs) exhibit unique viscoelastic behaviors crucial for various applications.
  • Switchable self-assembly offers precise control over micellar morphology.

Purpose of the Study:

  • To investigate the formation of CO2-switchable wormlike micelles (WLMs).
  • To explore the use of sodium dodecyl sulfate (SDS) and N,N,N",N"-tetramethyl-1,3-propanediamine (TMPDA) for creating switchable micellar systems.
  • To demonstrate the reversible transition between spherical and wormlike micelles triggered by CO2.

Main Methods:

  • Preparation of aqueous mixtures of sodium dodecyl sulfate (SDS) and N,N,N",N"-tetramethyl-1,3-propanediamine (TMPDA) at a 2:1 mole ratio.
  • Introduction of carbon dioxide (CO2) to protonate TMPDA, inducing micelle formation.
  • Cryogenic transmission electron microscopy (cryo-TEM) for structural verification.
  • Monitoring of micellar transitions upon CO2 removal (deprotonation).

Main Results:

  • CO2 bubbling protonated TMPDA, forming pseudogemini surfactants that self-assembled with SDS into viscoelastic WLMs.
  • Cryo-TEM confirmed the formation of WLMs under CO2 exposure.
  • Removal of CO2 led to deprotonation of TMPDA, dissociation of pseudogeminis, and formation of low-viscosity spherical micelles.
  • The sphere-to-worm transition was reversible over multiple cycles without loss of responsiveness.

Conclusions:

  • A novel CO2-switchable WLM system was successfully developed using SDS and TMPDA.
  • The system exhibits reversible transitions between viscoelastic WLMs and spherical micelles in response to CO2.
  • This CO2-triggered switchability offers a promising pathway for developing tunable soft materials.